hsdns

Asynchronous DNS Resolver

http://github.com/peti/hsdns

Version on this page:1.7
LTS Haskell 24.16:1.8@rev:1
Stackage Nightly 2025-10-24:1.8@rev:1
Latest on Hackage:1.8@rev:1

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LGPL-3.0-only licensed by Peter Simons, Lutz Donnerhacke, Григорий Холомьёв, Evan Rinehart
Maintained by Peter Simons
This version can be pinned in stack with:hsdns-1.7@sha256:61758c5393572e3591e2828f681fb1329c061074ba1c8e251e6886d951eae45c,3509

Module documentation for 1.7

Used by 1 package in nightly-2017-12-10(full list with versions):
hsdns

This library provides an asynchronous DNS resolver on top of GNU ADNS http://www.chiark.greenend.org.uk/~ian/adns/. Not all options are supported, but A, MX, and PTR lookups work nicely. There is also support for retrieving generic RR types, CNAMEs, and for NSEC zone walking. The library can be expected to work with fine ADNS 1.4 or later. It might also work with version ADNS 1.3, but that hasn't been tested.

The example program adns-reverse-lookup.hs demonstrates how the resolver is used. Given a list of host names on the command line, it performs an A/PTR double-lookup and checks whether the records are consistent. The output is printed in the order in which the DNS responses arrive:

$ ./adns-reverse-lookup cryp.to localhost www.example.com
OK: localhost <-> 127.0.0.1
FAIL: cryp.to -> 217.19.183.102 -> ["zuse.cryp.to"]
OK: www.example.com <-> 192.0.32.10